/* Design System - Matt Livingston Portfolio */

:root {
  /* Colors */
  --background: #ffffff;
  --text: #1a1a1a;
  --text-light: #555555;
  --accent: #0066cc;
  --accent-hover: #0052a3;
  --border: #e0e0e0;
  --card-bg: #f9f9f9;
  --tag-warehouse: #1a5f2a;
  --tag-warehouse-bg: #e8f5e9;
  --tag-webdev: #7b1fa2;
  --tag-webdev-bg: #f3e5f5;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;

  /* Typography */
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-stack);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--background);
}

h1, h2, h3 {
  margin: 0 0 var(--space-sm);
  line-height: 1.2;
  font-weight: 600;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

p {
  margin: 0 0 var(--space-sm);
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Layout */
.container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-md);
}

/* Landing Page */
.landing {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--space-lg);
}

.landing h1 {
  font-size: 2.25rem;
  margin-bottom: var(--space-xs);
}

.landing .tagline {
  color: var(--text-light);
  font-size: 1.125rem;
  margin-bottom: var(--space-xl);
}

.nav-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  width: 100%;
  max-width: 280px;
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  background: var(--accent);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  min-height: 48px;
  transition: background-color 0.15s ease, transform 0.15s ease;
}

.button:hover {
  background: var(--accent-hover);
  text-decoration: none;
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(0);
}

.button-outline {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
}

.button-outline:hover {
  background: var(--accent);
  color: #ffffff;
}

.button-small {
  padding: 10px 20px;
  font-size: 0.9375rem;
  min-height: 44px;
}

/* Page Header */
.page-header {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-lg);
}

.page-header h1 {
  margin-bottom: var(--space-xs);
}

.page-header .tagline {
  color: var(--text-light);
  font-size: 1.125rem;
  margin-bottom: var(--space-sm);
}

.page-header .trust-signal {
  font-size: 0.8125rem;
  color: var(--tag-warehouse);
  margin: 0;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9375rem;
  color: var(--text-light);
  margin-bottom: var(--space-sm);
}

.back-link:hover {
  color: var(--accent);
}

/* Filter Buttons */
.filter-bar {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 16px;
  background: transparent;
  color: var(--text-light);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.875rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s ease;
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.filter-btn.active {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

/* Tool Cards */
.tools-grid {
  display: grid;
  gap: var(--space-md);
}

.tool-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: var(--space-md);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.tool-card h3 {
  margin-bottom: var(--space-xs);
}

.tag {
  display: inline-block;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: var(--space-sm);
}

.tag-warehouse {
  background: var(--tag-warehouse-bg);
  color: var(--tag-warehouse);
}

.tag-webdev {
  background: var(--tag-webdev-bg);
  color: var(--tag-webdev);
}

.tool-card p {
  color: var(--text-light);
  font-size: 0.9375rem;
  margin-bottom: var(--space-md);
}

.tool-card .button {
  width: 100%;
}

/* Featured Cards */
.tool-card.featured {
  border: 2px solid var(--accent);
  background: linear-gradient(to bottom right, rgba(0, 102, 204, 0.03), transparent);
  position: relative;
}

.featured-badge {
  position: absolute;
  top: -1px;
  right: var(--space-md);
  background: var(--accent);
  color: white;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 10px;
  border-radius: 0 0 6px 6px;
}

/* Tech Badges */
.tech-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: var(--space-md);
}

.tech-badge {
  font-size: 0.6875rem;
  padding: 3px 8px;
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-light);
  font-weight: 500;
}

/* Writing Page */
.placeholder-content {
  padding: var(--space-xl) 0;
}

.placeholder-content p {
  color: var(--text-light);
  font-size: 1.125rem;
}

/* Footer */
.footer {
  margin-top: var(--space-xl);
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-content {
  color: var(--text-light);
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-sm);
}

.footer-links a {
  color: var(--text-light);
}

.footer-links a:hover {
  color: var(--accent);
}

/* Landing Footer */
.landing-footer {
  position: absolute;
  bottom: var(--space-lg);
  left: 0;
  right: 0;
  text-align: center;
}

.landing-footer .footer-content {
  font-size: 0.8125rem;
}

/* Responsive - Tablet and up */
@media (min-width: 600px) {
  .landing h1 {
    font-size: 2.75rem;
  }

  .landing .tagline {
    font-size: 1.25rem;
  }

  .nav-buttons {
    max-width: 320px;
  }

  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .tool-card .button {
    width: auto;
  }
}

/* Responsive - Desktop */
@media (min-width: 900px) {
  .container {
    max-width: 960px;
  }

  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Utility - Hide */
.hidden {
  display: none !important;
}

/* Print styles */
@media print {
  .button, .filter-bar, .back-link {
    display: none;
  }
}